/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.dao;

import org.apache.dolphinscheduler.dao.entity.MonitorRecord;
import org.apache.dolphinscheduler.dao.utils.H2Performance;
import org.apache.dolphinscheduler.dao.utils.MySQLPerformance;
import org.apache.dolphinscheduler.dao.utils.PostgreSQLPerformance;
import org.apache.dolphinscheduler.spi.enums.DbType;

import java.sql.Connection;
import java.sql.DriverManager;
import java.util.ArrayList;
import java.util.List;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class MonitorDBDao {

  private static final Logger logger = LoggerFactory.getLogger(MonitorDBDao.class);

  public static final String VARIABLE_NAME = "variable_name";

  @Autowired
  private DataSource dataSource;

  private MonitorRecord getCurrentDbPerformance() {
    try (final Connection conn = dataSource.getConnection()) {
      String driverClassName = DriverManager.getDriver(conn.getMetaData().getURL()).getClass().getName();
      if (driverClassName.contains(DbType.MYSQL.toString().toLowerCase())) {
        return new MySQLPerformance().getMonitorRecord(conn);
      } else if (driverClassName.contains(DbType.POSTGRESQL.toString().toLowerCase())) {
        return new PostgreSQLPerformance().getMonitorRecord(conn);
      } else if (driverClassName.contains(DbType.H2.toString().toLowerCase())) {
        return new H2Performance().getMonitorRecord(conn);
      }
    } catch (Exception e) {
      logger.error("SQLException: {}", e.getMessage(), e);
    }
    return null;
  }

  /**
   * query database state
   *
   * @return MonitorRecord list
   */
  public List<MonitorRecord> queryDatabaseState() {
    List<MonitorRecord> list = new ArrayList<>(1);

    MonitorRecord monitorRecord = getCurrentDbPerformance();
    if (monitorRecord != null) {
      list.add(monitorRecord);
    }
    return list;
  }
}
